Thermal analysis and limiting oxygen index flammability tests were used for elucidation of details in phosphorous-nitrogen synergism in cotton modified with methylol phosphonopropionamide and subsequently hydrolyzed by acid. The results indicate that not d l the phosphorus incorporated into the material is effective for flame retardancy purposes in the condensed phase. The comparison of modified and acid hydrolyzed cotton has shown the important influence of nitrogen in the structure of the flame retardant. A simplified theory of nitrogen-phosphorus synergism, considering this influence, is proposed.

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Data are presented concerning the antifungal activity of 11 natural isothiocyanates and 27 synthetized analogues in Aspergillus niger, Penicillium cyclopium , and Rhizopus oryzae , as well as in 13 additional saprophytic and parasitic fungi. A remarkable antifungal activity was observed in some analogues of benzylisothiocyanate and β-phenylethylisothiocyanate. The latter-mentioned compounds have not been described previously. In the group of benzylisothiocyanates, a correlation, which was inversely proportional, was detected between ed 100 values for A. niger and R. oryzae and the corresponding molar solubilities of compounds in water. In contradistinction, no relationship was observed between antifungal activity and chemical reactivity of investigated derivatives.

Data are presented concerning the antifungal activity of 11 natural isothiocyanates and 27 synthetized analogues in Aspergillus niger, Penicillium cyclopium, and Rhizopus oryzae, as well as in 13 additional saprophytic and parasitic fungi. A remarkable antifungal activity was observed in some analogues of benzylisothiocyanate and ,B-phenylethylisothiocyanate. The latter-mentioned compounds have not been described previously. In the group of benzylisothiocyanates, a correlation, which was inversely proportional, was detected between EDloo values for A. niger and R. oryzae and the corresponding molar solubilities of compounds in water. In contradistinction, no relationship was observed between antifungal activity and chemical reactivity of investigated derivatives.

Antifungal activity on Aspergillus niger, Penicillium cyclopium , and Rhizopus oryzae , as well as on additional saprophytic and parasitic fungi, was determined in 57 substituted derivatives of phenylisothiocyanate. Most of the investigated compounds displayed rather equal activity against the three mentioned fungi, in contradistinction to the analogues of natural benzyl- and β-phenylethylisothiocyanate with their characteristic low activity against R. oryzae . Differences occurred in the type of activity of compounds in which the —NCS group is directly bound on the aromatic moiety, as compared with those compounds in which this group is bound to the aliphatic radical or to the aromatic moiety indirectly by means of the methyl group or by a longer aliphatic chain. The results obtained confirm the negative influence of ionized substituents on the aromatic moiety, i.e., of —COOH, —CH 2 — COOH, and —SO 3 H groups, as well as of substituents which cause an extreme increase in reactivity of the —NCS group resulting in a high instability of the entire isothiocyanate molecule.